\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 77 (Section  8.12.2 : Example with \tkzcname{tkzPointShowCoord})

\begin{tikzpicture}[scale=1.5]
   \tkzInit[xmax=3,ymax=2]
   \tkzAxeXY
   \tkzDefPoint(2,1){a}
   \tkzPointShowCoord(a)
   \tkzDrawPoint(a)
   \tkzLabelPoint(a){$A_1$}
   \tkzPointShowCoord({1,2})
   \tkzDrawPoint({1,2})
   \tkzLabelPoint({1,2}){$A_2$}
\end{tikzpicture}

\end{document}